Frequently Asked Question

Open your homepage in SharePoint via Office.com, open your groups from the links

This is the Home page of your group

Click on the members tab in the top right, this opens up the list of members and allows you to invite more people to join.

This will email your invitees with a request to join the group.

Update (04/07/2022):

In the event that the Add Members button is absent, the following workaround can be used if you are a site owner:

Open Site permissions from the settings cog

Select Advanced permission settings and click on the group which you want to add a user to.

From New you can add members by email address.